This week on Car Talk, Dan's new used Corolla may have come with a bonus gift. The previous owner says she threw her engagement ring at her fiance and it fell behind the dashboard. Is the ring still there, or on the new fiancee of the mechanic who previously looked for it? Also this week, Jennifer says her Subaru stinks--literally. She describes its smell as a combination of "old gas" and "dirty mechanic." Will Tom and Ray be too offended to give a diagnosis? And, Turi's best solution for her smoking Acura may be to just throw her keys down the sewer; and Brother Roger got some advice on tires from a mechanic whose heart was in the right place--unfortunately, his mouth wasn't. All this, plus a Valentine's Day recap from Ray's house, and lots more, this week on Car Talk.